Digi-Sec RJ45 Cat 6/5e/5 Coupler (12 Pack, White, Unshielded UTP) Genuine Digital-SECURE Brand - Shipped Fast by Amazon from the US and eligible for Amazon's 30-day returns policy and Prime or Super Saver Shipping Cat 5/5e Gigabit rated - can be used for Cat 6 (unshielded). Compatible with standard 4-wire RJ11 telephone/fax line Enables much longer cables to be made from shorter cables. Can be used with 4 wire RJ-11 telephone and fax cable cords Great for small or large multiple LAN workstation installations (temporary or permanent) PLEASE NOTE: These are not heavy duty couplers - not intended for use in harsh environments, outdoor or for testing applications where the Ethernet cable is repeatedly plugged and unplugged